I blew the 302 that was in my boat so I've been trying to repower to a 351 for quite a while. I've got everything back together and the 351W in the boat. I used the original 302 dipstick and tube. Was this a mistake? When I poured in the oil I've got nothing registering on the dipstick. Are the Dipsticks and Tubes for the 302 & 351 different or just the dipstick itself?